Acquisitions - Summary of Initial Consideration Paid for Acquisitions (Detail) - USD ($) $ in Thousands		12 Months Ended
	Apr. 01, 2014	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Fair value of assets acquired	$ 60,104
Less liabilities assumed	(5,805)
Net assets acquired	54,299
Less cash acquired			$ (1,277)
Cash paid		$ 34,396	$ 44,122
Professional Power Products, Inc. [Member]
Business Acquisition [Line Items]
Fair value of assets acquired		60,104
Less liabilities assumed		(5,805)
Net assets acquired		54,299
Less value of shares of Company common stock expected to be issued at date of acquisition		(8,900)
Less cash acquired	(1,300)	(1,277)
Cash paid	$ 45,400	$ 44,122